Linux in a Nutshell, Fifth Edition

Q | 765

sed

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p

[address1[,address2]]p

Print the addressed line(s). Note that this can result in duplicate

output unless default output is suppressed by using #n or the -n

command-line option. Typically used before commands that

change control flow (d, n, b), which might prevent the current line

from being output. See the Examples under h, n, and N.

P

[address1[,address2]]P

Print first part (up to embedded newline) of multiline pattern space

created by N command. Same as p if N has not been applied to a

line.

Example

Suppose you have function references in two formats:

function(arg1, arg2)

function(arg1,

arg2)

The following script changes argument arg2, regardless of whether

it appears on the same line as the function name:

s/function(arg1, arg2)/function(arg1, XX)/

/function(/{

N

s/arg2/XX/

P

D

}

q

[address]q

[address]q [value] {G}

Quit when address is encountered. The addressed line is first

written to the output (if default output is not suppressed), along

with any text appended to it by previous a or r commands. GNU

sed allows you to provide value, which is used as the exit status.

Examples

Delete everything after the addressed line:

/Garbled text follows:/q

Print only the first 50 lines of a file:

50q

Q

[address]Q [value] {G}

Quits processing, but without printing the pattern space. If value is

provided, it ...